Segment and Related Information - Summary of Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) reporting_unit	Sep. 30, 2020 USD ($)
Segment and Related Information [Abstract]
Number of operating segments | reporting_unit			2
Number of reportable segments | reporting_unit			2
Information as to the Company's segments [Abstract]
Revenue	$ 77,860	$ 54,847	$ 201,277	$ 155,270
Operating loss	(14,109)	(998)	(37,105)	(12,171)
Other expense, net	(539)	(486)	(931)	(1,250)
Interest expense, net	(5,406)	(2,235)	(12,503)	(6,318)
Loss on extinguishment of debt	(11,916)	0	(11,916)	(8,123)
Net loss	(31,970)	(3,719)	(62,455)	(27,862)
Depreciation and amortization	8,316	3,452	20,103	10,152
Capital expenditures including software costs	1,961	2,015	6,399	7,061
United States
Information as to the Company's segments [Abstract]
Revenue	71,595	51,036	186,325	148,293
Other Countries
Information as to the Company's segments [Abstract]
Revenue	6,265	3,811	14,952	6,977
Corporate, Non-Segment
Information as to the Company's segments [Abstract]
Operating loss	(427)	(9)	(766)	57
Depreciation and amortization	2,453	1,388	6,051	4,226
Capital expenditures including software costs	177	276	465	398
Restaurant/Retail
Information as to the Company's segments [Abstract]
Revenue	59,821	37,347	147,529	102,389
Restaurant/Retail | Operating segments
Information as to the Company's segments [Abstract]
Operating loss	(15,642)	(2,763)	(40,894)	(16,530)
Depreciation and amortization	5,833	1,984	13,789	5,790
Capital expenditures including software costs	1,645	1,324	5,342	5,814
Government
Information as to the Company's segments [Abstract]
Revenue	18,039	17,500	53,748	52,881
Government | Operating segments
Information as to the Company's segments [Abstract]
Operating loss	1,960	1,774	4,555	4,302
Depreciation and amortization	30	80	263	136
Capital expenditures including software costs	$ 139	$ 415	$ 592	$ 849